#zong{
	width: 800px;
	height: 400px;
	margin: 150px auto;
	position: relative;
	border-radius: 30px;
}
img{
	width: 100%;
	height: 100%;
	border-radius: 30px;
	border: none;
	z-index: 1;
}
#zuo {
	position: absolute;
	z-index: 3;
	top: 175px;
	width: 83px;
	height: 83px;
	border: none;
	left: 5px;
	background: url(../img/left.png)no-repeat center;
	border-radius: 15px;
}
#you{
	position: absolute;
	z-index: 3;
	top: 175px;
	width: 83px;
	height: 83px;
	border: none;
	right: 5px;
	background: url(../img/right.png) no-repeat center;
	border-radius: 15px;
}